package com.zzf.观察者模式;

public class Customer implements Observer{
    @Override
    public void update(Object arg) {
        int priceVar = (Integer)arg;
        if (priceVar > 0){
            System.out.println("消费者:东西又贵了");
        }else if (priceVar < 0){
            System.out.println("消费者：降价了");
        }
    }
}
